Model: WF3CB. Not to be confused with filter ultraWF, which is longer. 1706465, 242069601, 242069603, 242294501, AP4567491, P242069601, SWF3CB, WF3CB, WF3CB12. IT IS WF3CB! NOT ULTRAWF! Replace the refrigerator filter, Change your water and air filters every 6 months for best results;.